A new web cam was added a few days ago and now the image is much larger than the prior one. I wonder if the present quiet period may end in the near future,or it will continue sleeping. GCANE,if you see signs of life,please tell us.

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A new web cam was added a few days ago and now the image is much larger than the prior one. I wonder if the present quiet period may end in the near future,or it will continue sleeping. GCANE,if you see signs of life,please tell us.

4 to 11 November 2011 Paul D. Cole Published on 11 November 2011 Hits: 312 Activity at the Soufrière Hills Volcano is at a low level.

The seismic network recorded three rockfalls and six volcano-tectonic events this week.

The average sulphur dioxide measurement over six days this week was 360 tons per day with a maximum of 645 and a minimum of 250 tons per day.

Clear views of the dome showed no changes in morphology and no fresh rockfall deposits were identified.

There was a moderate sized lahar in the Belham valley on 9 November associated with an intense thunderstorm. Caution should be exercised crossing the Belham valley during periods of heavy rain.

Despite the low level of activity, pyroclastic flows can still occur without any warning. The Hazard Level is 2. There is daytime access (8:00 am to 4:00 pm) to Zone C. Maritime zone W remains daytime transit only (boats may sail through the zone but must not stop)

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Around 5:20 pm (local time) on 9 March 2012, a small pyroclastic flow travelled down the western flanks of Soufriere Hills Volcano down Spring Ghaut. This small pyroclastic flow went about 1 kilometre to the west towards Plymouth before the ash dissipated in a small ash cloud, which rose about another 4000 feet and towards St. Georges Hill out to sea. The event was caught on the camera on Garibaldi Hill (pictured above) as well as on the thermal camera.

MVO’s seismic monitoring network also recorded the event. To the left is a plot of the seismic signal generated by the flow, as recorded from the seismometer at Fergus Ridge. MVO’s seismometers record pyroclastic flows as they occur. The shaking recorded by the seismometers is caused by the material in the flow colliding with the ground as it travels.

There were no precursors to this event. Although activity has generally been low, this event clearly illustrates that Soufriere Hills Volcano is still an active volcano and that pyroclastic flows can occur at any time with little to no warning.

Let's see what occurs in the next hours and days as a definite increase in ash plume can be seen in the cam and confirmed by the folks who are there. See the cam down at the end of this post.

Activity at the Soufrière Hills Volcano is low, although seismicity has increased.

The seismic network recorded nine rockfalls, one hundred and five volcano-tectonic (VT) and four hybrid earthquakes. Two swarms of VT earthquakes have occurred, one between 16:04 and 16:51 hrs on the 22 March with 49 events and another between 03:10 and 05:27 hrs on 23 March with 54 events. Earthquakes in the second swarm were markedly larger than those in the first.

The average sulphur dioxide measurement this week was 433 tonnes per day with a maximum of 654 and a minimum of 282 tonnes per day.

Observations on the morning of 23 March showed several changes on the volcano. Steam venting (Fumarolic) activity on the volcano has increased and a new steam vent (fumarole) has appeared on the northwest face of the lava dome behind Gages Mountain. A pulsing steam vent containing a small amount of ash has formed in the back of the February 2010 collapse scar. Very light ashfall is occurring on the western flank of the volcano. Audible roaring associated with the venting can be heard intermittently from MVO, 5.75 km NW of the volcano.

Pyroclastic flows can still occur at any time without warning. Lahars (mudflows) remain a hazard. Tracks across the Belham valley are frequently destroyed or heavily modified by lahars, therefore caution should be exercised crossing the valley during and after rainfall.

RMK: THE VO RPTS INCR SEISMIC ACTIVITY WITHVENTING OF GASES AND OCNL SMALL EMISSIONS OF VA.THE VA FALLS OUT WITHIN 1 NM OF SUMMIT WITH GASESFANNING OUT W-SW AROUND 23NM. IF MORE ASH RPRTDWILL UPDATE. ...SWANSON

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